Firearm with trigger assembly and slide arm assembly supported by barrel lug



July 3, 1962 J. E. BROOKS, JR

FIREARM WITH TRIGGER ASSEMBLY AND SLIDE ARM ASSEMBLY SUPPORTED BY BARRELLUG Filed Sept. 1, 1960 INVENTOR JULIUS E. BROOKS JR.

United States Patent 3,041,768 FREARM WITH TRIGGER ASSEMBLY AND SLIDEARM ASSEMBLY SUFPORTED BY BARREL LUG Julius E. Brooks, Jr., Branford,Conn., assignor to Olin Mathieson Chemical Corporation, a corporation ofVirginia Filed Sept. 1, 1960, Ser. No. 53,405

Claims. (Cl. 4216) The present invention relates to slide actionfirearmssometimes referred to as pump guns.

A particular feature of the present invention is the provision of anovel take-down assembly.

A further feature of the invention is the provision of a slide actionfirearm wherein the forearm portion of the action is suspended in anovel fashion.

A further feature of the invention is the provision of a slide actionfirearm wherein the forearm while disposed in the actuated position,relative to the barrel, presents an exterior appearance which isentirely free of guide rods, rails, or tracks,

A further feature of the invention is the provision of a slide actionforearm structure movable from a forward position corresponding a firingposition to a rear position corresponding to an ejection positionwherein the gun action is entirely enclosed within the forearm at bothpositions.

A firearm embracing certain features of the present invention and havingnovel take-down characteristics may comprise a barrel including adepending lug suitably connected to a receiver, a trigger assemblyincluding a pair of spaced rails removably connected to the receiver andto the barrel wherein one end of the assembly engages the lug and theopposite end thereof engages the receiver, a slide arm assemblyincluding a pair of slide arms carried by the rails and removablyconnected to the lug, a forearm rigidly secured to the slide armassembly, said forearm cooperating with the barrel effective to enclosethe slide arms so that when the forearm is moved from a firing positionto an ejection position, the underside of the barrel is entirely free ofguide rods and similar members.

Other features and advantages of the present invention will become moreapparent from an examination of the succeeding specification when readin conjunction with the appended drawings in which:

FIG. 1 is a side view of a portion of a firearm embracing the principlesof the present invention with certain portions thereof broken away forclarity;

FIG. 2 is an illustration similar to FIG. 1 showing the forearm in theejection position;

FIG. 3 is a view of the underside of the arrangement shown in FIG. 2with the forearm removed, and,

FIG. 4 is a vertical section taken along the lines 44 in FIG. 2 showingthe cooperation between the slide arm assembly and the forearm.

Referring now in detail to the drawing, a receiver is shown in threadedengagement with a barrel 11 carrying a depending lug 12 formed with apair of undercut circular grooves 13 and 14.

A trigger assembly 16 includes a trigger guard 17, spaced slide rails1818, bridge member 19 and connector tab 21.

The rear or left end of the trigger assembly 16 is fastened to thereceiver by means of a through pin 22 while the forward end thereof issecured to the barrel by the engagement of an elongated slot 23 formedin the tab 21 with the undercut groove 14 of the lug 12.

A bolt 24 is disposed in the receiver and is actuated in well knownfashion by a slide arm assembly, indicated generally by the referencenumeral 26.

The slide arm assembly comprises a guide portion 27 having an elongatedslot 28 operative to engage and move along, in reciprocatory fashion,relative to the lug 12 wherein the guide 27 rides in the undercut groove13.

As is most apparent in FIGS. 1, 3 and 4, the guide 27 includes a pair ofopposed, upwardly flared wings 29 and 31 operative to engagecorresponding ways '32 and 33 formed in a forearm 34.

The forearm is rigidly connected to the guide 27 of the slide armassembly by means of a fastener 36.

Thus, the forward portion of the forearm is supported by the fastener 36While the rear portion thereof is supported or carried by thecooperation between the flared wings 29 and 31 and the Ways 32 and 33.

When the forearm is moved from the firing position shown in FIG. 1 tothe ejection position shown in FIG. 2, the bridge member 19 of thetrigger assembly is received within and guides the forearm while theslide arm assembly is driven to the left as viewed in FIGS. 1 and 2 tomove bolt 24 from a closed position to an open position.

Note that the connection between the bolt and the slide arm isaccomplished by the cooperation between a saddle 37 bridging spacedslide arms 3939 (only one shown) and a corresponding notch 38 cut out ofthe bolt.

As the forearm reciprocates to and fro between the position shown inFIG. 1 and FIG. 2, the guide 27 slides along the groove 13 in the lug 12while the slide arms 3939 move along and are supported by the rails 18-18, as is most apparent in FIG. 1.

By virtue of the slide action arrangement just described, it is possibleto manipulatethe forearm from a firing position to an ejection positionwithout exposing unsightly elements of the action.

Note that when the slide arm is in the ejection position shown in FIG.2, there are no rod pins or other guide members extending through theforearm or depending from the barrel.

To take down the action of the present invention, one merely removes thethreaded fastener 36 from the forward portion of the guide 27.

Thereafter the forearm may be removed to the right relative to the guide27 to withdraw it from engagement with the flared wings 29 and 31 of theslide arm assembly.

The next step is to tap out the pin 22 releasing the left end of thetrigger assembly from the receiver.

Thereafter one shifts the trigger assembly to the right, as viewed inFIG. 1, so that the enlarged portion 43 of the slot indicated generallyby the reference numeral 23 in the tab 21 permits the tab to dropdownwardly clear of the lug 12.

Upon removal of the trigger assembly, the slide arms 39 are free to dropdownwardly a sufficient distance to permit disengagement between thebolt 24 and the saddle 37.

Thereafter slight motion of the slide arm assembly 26 to the right asviewed in FIG. 1 will present an enlarged opening 44 to the lug 12, andthis will permit the right end of the slide arm assembly to drop free ofthe lug in the same manner as described in connection with the lockingtab 21.

In an alternative arrangement of the present invention, the bolt 24 isformed integrally with the slide arm assembly 26 and the enlargedopening 44 is located at the point designated 44' in FIG. 1.

The take-down steps are varied so that removal of the combined bolt andslide arm assembly is effected by sliding the combined assembly to theejection position. The enlarged opening 44 permits the right end of theassembly to drop clear of the lug 12 and the combined bolt and slide armassembly is then drawn to the right and removed.

The firearm is assembled by reversing the steps just described.

What is claimed is:

1. In a slide action firearm including a barrel having opposed ends, atrigger assembly and a receiver, a forearm movable relative to thebarrel from a firing position to an ejection position, said triggerassembly being removably secured to the receiver and to the barrel, saidtrigger assembly being suspended and supported at a point on thereceiver and at a spaced point located between the ends of the barrel, aslide arm assembly carried by the trigger assembly and keyed to thebarrel at said spaced point, said slide arm assembly being movable inreciprocatory fashion relative to said trigger assembly and relative tosaid barrel, said forearm secured to said slide arm assembly andcooperating with the barrel to enclose the slide arm assembly so thatwhen the forearm moves from one position to the other, marginal regionssurrounding the barrel are entirely free of obstructions orprotuberances.

2. The firearm of claim 1 wherein the trigger assembly includes a pairof rails upon which the slide arm assembly is slidably carried.

3. The firearm of claim 1 wherein said slide arm assembly is formed withwings operative to carry the fore- 25 arm.

4. A slide action firearm having desirable takedown features comprisinga barrel having a depending lug, a receiver, a slide arm assemblyoperable to engage the lug and move relative thereto, a forearmconnected to the slide arm assembly and movable in reciprocatory fashionalong the barrel in company with the slide arm assembly, a triggerassembly including a pair of spaced rails operative to provide a trackfor the slide assembly and a guide for said forearm, said triggerassembly being connected at one end to the receiver and at the other endto said depending lug, said slide arm assembly 'having flaring sideWalls operative to cooperate with and engage mating recesses formed inthe forearm to provide support for the forearm.

5. The firearm of claim 1 wherein the slide arm assembly includes boltmeans integrally connected thereto.

References Cited in the file of this patent UNITED STATES PATENTS1,110,837 Swebilius et al. Sept. 15, 1914 2,832,165 Ivy Apr. 29, 19582,922,240 Allyn Jan. 26, 1960 FOREIGN PATENTS 148,719 Great Britain Aug.5, 1920

